Puredick&reg; Battery for Dell Precison M4600 M4700 M6600 M6700 Laptop FV993 PG6RC R7PND 0TN1K5 NEW Laptop Notebook Computer- 18 Months Warranty [Li-ion 9-cell 11.1V 7800/86Wh] Battery Type: Li-ion || Voltage: 11.1V || Capacity: 7800/86Wh|| Color: Black||Cells: 9-cell 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. CE-/FCC-/RoHS certificated for safety,18 months warranty,professional technical support, efficient and always satisfied customer service 24 x 7 email support. Operation time:Same Battery life with Brand new original Dell battery.In reality, this will depend on the amount of electricity required by the device and how you use it